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Plant oxidosqualene cyclase (OSC) is classified into two types depeneding on its catalytic mechanisms and products: cycloartenol synthase and triterpene synthase. A cDNA probably encoding OSC was cloned from bulbs of Allium macrostemon by RT-PCR. The cDNA contains a 2289-bp open reading frame, encoding 762 amino acids. A higher degree of homology (73%) was found for the gene product with the known cycloartenol synthases than with the triterpene synthases (51-55%), indicating its most likelydoi:10.5511/plantbiotechnology.16.311 fatcat:ugzcsr6xgnbgbad4cai32buwry